PDF malware analysis — malicious · 0477fc5a47d17f6e

MALICIOUS

PDF

3.2 KB Created: 2007-12-35 21:45:26 Authoring application: Adobe

MD5: 5b4bde0d9850b3a26bfd5a8e79d0f154 SHA-1: e8acba30559a89a16eeaf63139f5326c61f7a33b SHA-256: 0477fc5a47d17f6e8a4e2c6d26e44c6912b39df533f9d2b1418de7445f2825cd

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is heavily obfuscated, but heuristic analysis indicates it is part of an exploit cluster. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, named 'javascript_obj0036_002.js', is the primary indicator of malicious activity, likely serving to download and execute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0036_002.js` `c4856020fc2b3940aabb9a630df4aa63c0c0e621c18e358b07fd9526f5a2008c`	pdf-javascript-stream	PDF /JS object 36 at offset 0x80	12118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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